Malicious PDF — malware analysis report

Static analysis result for SHA-256 678d75e779fbfe96…

MALICIOUS

PDF

117.5 KB Created: 2021-02-18 10:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e56c74d481dad138be8326d5f4178570 SHA-1: 1fb4b3cae986c466bc27bf45fb7dbf7d8859c66a SHA-256: 678d75e779fbfe962cef3199cbd48392adf03decaf6553caeaebf30c6860e47b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to 'crossword answers' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the PDF. The presence of external URIs and the overall structure align with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=capitulo+5a+crossword+answers PDF link annotation
    • http://bridgecommerce.com/samsung_alarm_clock_soundu5thi.pdfIn PDF document text
    • http://tortomsk.ru/how_to_program_a_motorola_apx_6000421ol.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/encyclopedia_of_general_science_downloadgzy0z.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/obafemi_awolowo_university_logo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_6004f8245b8b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_600a9e878776d.pdfIn PDF document text
    • http://spiritstudio.ru/minecraft_tutorial_world_download_javaxcxmj.pdfIn PDF document text
    • http://pububasolemi.22web.org/hwy_287_traffic_report.pdfIn PDF document text
    • http://tehnotop.store/minecraft_new_mob_vote_2019b6j3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_601b12c91c5a3.pdfIn PDF document text
    • http://euromarket.pro/make_letter_tracing_worksheetsncera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5fe50713d6d00.pdfIn PDF document text
    • http://nulonelam.66ghz.com/77313040183.pdfIn PDF document text
    • http://8gusevshop.website/jubelufevadewiteqkvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vemusimovoxodan.rf.gd/32107318384.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/jukavafoludupekigiteweja.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/rodod.pdfIn PDF document text
    • http://dipuritaxuxok.rf.gd/69177544023.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/atlassian_confluence_templates.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/wasatexejidujuzagifamobo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18729 5188 bytes
SHA-256: f2e66886f3e8299fccaaee75bf28bb9033800a123f934d34cb2e07cda89c9b83
font_01_sfnt_off000198eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198EB 15416 bytes
SHA-256: 6551057ae6c18892bad094ba235d51a2b8f35900a3375f8b68cd04030ef0d9cc

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